3x+9=81-7x

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Solution for 3x+9=81-7x equation:


Simplifying
3x + 9 = 81 + -7x

Reorder the terms:
9 + 3x = 81 + -7x

Solving
9 + 3x = 81 + -7x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '7x' to each side of the equation.
9 + 3x + 7x = 81 + -7x + 7x

Combine like terms: 3x + 7x = 10x
9 + 10x = 81 + -7x + 7x

Combine like terms: -7x + 7x = 0
9 + 10x = 81 + 0
9 + 10x = 81

Add '-9' to each side of the equation.
9 + -9 + 10x = 81 + -9

Combine like terms: 9 + -9 = 0
0 + 10x = 81 + -9
10x = 81 + -9

Combine like terms: 81 + -9 = 72
10x = 72

Divide each side by '10'.
x = 7.2

Simplifying
x = 7.2

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